Grade 9 3.5 Enzymes

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So...what are enzymes and how do they function.
Essentially and enzyme is a biological catalyst. A catalyst in turn is a substance that can affect the rate of a chemical reaction (while not being affected by the process).
Here are the presentations we saw in class:
Lesson 9 intro to enzymes
Lesson 10 enzyme temperature and pH
Lesson 11 enzymes in digestion


And here is the rubric from the design practical:
design enzyme practical

The videos below should help: